EMPI - Reactive Fluids

Intracavity absorption spectroscopy (ICAS) is one of the most sensitive spectroscopic methods. The sample to be analyzed, typically in the gas phase, is introduced into the laser resonator so that the laser and sample form a single unit. This results in a coupling of the laser dynamics with the absorption of the sample, which leads to an enormous sensitivity, i.e., detection limits of down to several ppt (parts per trillion). Typically, broadband lasers are used, e.g., fiber lasers, dye lasers, and crystal lasers that cover the spectral range from the visible to the mid-infrared. Several absorption lines are simultaneously measured.